CN112858460A - Method for measuring concentration of solid-phase medium in solid-liquid two-phase fluid - Google Patents
Method for measuring concentration of solid-phase medium in solid-liquid two-phase fluid Download PDFInfo
- Publication number
- CN112858460A CN112858460A CN202110010310.1A CN202110010310A CN112858460A CN 112858460 A CN112858460 A CN 112858460A CN 202110010310 A CN202110010310 A CN 202110010310A CN 112858460 A CN112858460 A CN 112858460A
- Authority
- CN
- China
- Prior art keywords
- solid
- liquid
- phase
- concentration
- phase fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/74—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables of fluids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention relates to a method for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid, which utilizes an electromagnetic induction method to generate a magnetic field, the measured solid-liquid two-phase fluid cuts a magnetic induction line to generate induced electromotive force, and the concentration of the solid-phase medium in the solid-liquid two-phase fluid is indirectly measured by measuring the induced electromotive force, so that the automatic real-time test can be realized, and the concentration of the solid-phase medium and the real-time change of the concentration of the solid-liquid two-phase medium in the flowing dynamic process can be monitored in real. Air bubbles are formed by an air compressor to drive the solid-phase medium and the liquid-phase medium in the solid phase and the liquid phase to be rapidly mixed, and the aqueous magnetofluid with magnetic particles as ferrite has small dependence on temperature, thereby preventing the interference on a test result caused by the change of the temperature and improving the test accuracy. The exciting coils of the induction coil group and the reduction coil group are all Helmholtz magnetic coils, so that the uniformity of a generated magnetic field is improved, and the measurement accuracy is improved.
Description
Technical Field
The invention relates to the field of fluid medium concentration testing, in particular to a method for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid.
Background
In the fields of modern industries such as petroleum, chemical engineering, nuclear power, ocean engineering and the like, a conveying pipeline is widely applied to the transmission of various fluid media, and solid-liquid two-phase fluid is the most common conveying medium in the industrial application. In the industrial process, the detection of the concentration of the solid-phase medium of the solid-liquid two-phase fluid is important for the characteristic research of the solid-liquid two-phase medium, the improvement of the efficiency and the yield in some production processes and the monitoring of the whole production.
In the prior art, the method for detecting the concentration of a solid-phase medium in a solid-liquid two-phase fluid usually adopts manual sampling detection, namely, sampling firstly, collecting a solid waste sample into an open heat-resistant container, then weighing, then putting the container into a heating box for heating, after a period of time, completely volatilizing the liquid in the solid waste, then weighing, and calculating the concentration of the solid-liquid two-phase fluid by calculating the mass difference before and after heating. The detection mode has simple principle and low cost, can carry out rough detection under the condition of low requirement on analysis data of solid-phase medium components, and has wide application. The main defects of the detection mode are that the automation degree is not high, although the principle is simple, the operation is complex, the labor cost is high, the detection mode is almost completely based on manual operation, and the efficiency is low; the real-time change of the concentration of the solid-liquid two-phase medium in the flowing dynamic process is not beneficial to be monitored in real time; when the concentration of the solid-phase medium in the solid-liquid two-phase fluid is low, a large amount of sampling is needed to ensure the testing precision, multiple samples are measured one by one, the workload is large, the data processing is complicated, the error accumulation is easy, and the measuring accuracy is difficult to ensure.
Disclosure of Invention
The invention aims to provide a method for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid, which aims to solve the technical problems in the background technology, wherein the concentration of the solid phase medium is limited to be volume percent (vol%) of the solid phase medium in the solid-liquid two-phase fluid, and the invention provides the following technical scheme for realizing the aim:
a method for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid, which utilizes an electromagnetic induction method to generate a magnetic field, cuts a magnetic induction line by the measured solid-liquid two-phase fluid to generate induced electromotive force, and indirectly measures the concentration of the solid phase medium in the solid-liquid two-phase fluid by measuring the induced electromotive force, and is characterized by comprising the following steps:
step 1, preparing the aqueous magnetofluid, namely diluting the aqueous magnetofluid to a concentration of 0.1 vol.% by using distilled water, and mixing the diluted aqueous magnetofluid with the concentration of 0.1 vol.% with the measured solid-liquid two-phase fluid as a liquid phase carrier of the measured solid-liquid two-phase fluid, wherein magnetic particles of a solid phase in the aqueous magnetofluid are ferrite.
Step 2, opening a first stop valve and a second stop valve, closing a third stop valve and a fourth stop valve, starting a first centrifugal pump to enable a medium in a pipeline to circularly flow, circularly conveying only aqueous magnetic fluid with the concentration of 0.1 vol.% in the pipeline by using the first centrifugal pump, starting an air compressor, opening a needle valve, conveying pressure gas into the pipeline to drive the aqueous magnetic fluid to be uniformly mixed, starting an air separator to separate gas, activating a bipolar power supply through a signal generator to convey current to an excitation coil of a reduction coil group, connecting the reduction coil group and an induction coil group in series to enable the induction coil group to induce a magnetic field, connecting an induction coil on one side of the induction coil group to an induction coil on one side of a signal amplifier and the reduction coil group respectively, and connecting an induction coil on the other side of the induction coil group to an induction coil on the other side of the signal amplifier and the reduction coil group respectively, induction coils on two sides of the reduction coil group are respectively connected to the signal amplifier; the signal amplifier is connected with a high-pass filter, and the high-pass filter is connected with an analog-to-digital conversion computer; and the induction coil on one side of the reduction coil group is connected to the excitation coil of the induction coil group, and an analog-digital conversion computer reads the water-based magnetic fluid cutting magnetic induction line in the inclined pipeline to generate induced electromotive force V (q is 0).
Step 3, discharging aqueous magnetic current with preset volume in a measuring deviceOpening a switch valve of a sampling volume box to mix the sampled solid-liquid two-phase fluid with 0.1 vol.% of aqueous magnetofluid, closing the switch valve of the sampling volume box, continuing to utilize an air compressor to convey pressure gas into the pipeline to drive the aqueous magnetofluid to be uniformly mixed with the sampled measured solid-liquid two-phase fluid, opening an air separator to separate gas, continuing to activate a bipolar power supply through a signal generator to convey current to an excitation coil of a reduction coil group, reading a fluid medium cutting magnetic induction line formed by mixing the aqueous magnetofluid in the inclined pipeline and the sampled measured solid-liquid two-phase fluid through an analog-to-digital conversion computer to generate induced electromotive force V (q)exp)。
And 4, discharging all mixed fluid media in the pipeline, closing the air separator, closing the first stop valve, the second stop valve and the first centrifugal pump, closing the signal generator and the bipolar power supply, opening the third stop valve and the fourth stop valve, starting the second centrifugal pump to pump clean water, cleaning the pipeline, and then conveying dry pressure gas into the pipeline by using an air compressor to dry the pipeline.
And 5, closing the third stop valve, the fourth stop valve and the second centrifugal pump, opening the first stop valve and the second stop valve, starting the first centrifugal pump, opening a switch of the sampling volume box to fill the pipeline with the sampled solid-liquid two-phase fluid, only circularly driving the sampled measured solid-liquid two-phase fluid in the pipeline by the first centrifugal pump, continuously utilizing an air compressor to convey pressure gas into the pipeline to drive the sampled solid-liquid two-phase fluid to be uniformly mixed, opening an air separator to separate gas, activating a bipolar power supply through a signal generator to convey current to an excitation coil of the reduction coil group, and reading the sampled measured solid-liquid two-phase fluid in the inclined pipeline through an analog-to-digital conversion computer to cut a magnetic induction line to generate induced electromotive force V (q is 1).
And 6, correcting and calculating the concentration q of the solid-phase medium in the measured solid-liquid two-phase fluid:
and Δ V(cal.)＝Vrms(q＝0)-Vrms(q＝1)In which V isrms(q＝0)When only the aqueous magnetofluid is in the inclined pipeline in the step 2, the magnetofluid cuts the magnetic induction lines to generate a plurality of groups of induced electromotive force V (q is 0) values; wherein Vrms(exp)When the aqueous magnetofluid in the inclined pipeline in the step 3 is mixed with the sampled measured solid-liquid two-phase fluid, the mixture cuts a plurality of groups of induced electromotive force V (q) generated by magnetic induction linesexp) A root mean square value of the values; wherein Vrms(q＝1)And 5, when only the measured solid-liquid two-phase fluid is sampled in the inclined pipeline in the step 5, cutting the magnetic induction lines to generate multiple groups of induced electromotive force V (q is 1) values.
All the pipelines are transparent pipelines, so that the flowing form of the fluid medium is convenient to observe.
The switch valve of the sampling volume box is an electromagnetic control switch valve.
The first centrifugal pump and the second centrifugal pump are arranged in parallel.
The second centrifugal pump is connected with the clean water tank and driven by the motor.
The inclined angle of the inclined pipe is 30 degrees.
The pressure gauges are arranged at two ends of the inclined pipeline to be measured, and the pressure data recorder is connected between the two pressure gauges.
The exciting coils of the induction coil group and the reduction coil group are all Helmholtz magnetic coils.
An analog-to-digital converter in the analog-to-digital conversion computer converts instantaneous induced electromotive force into digital signals, the sampling frequency is 1000hz, the sampling number is 5000, the specifications of the analog-to-digital converter are that the voltage input range is plus or minus 10V, and the resolution is 16 bit.
The measuring device used in the method for measuring the concentration of the solid-phase medium in the solid-liquid two-phase fluid comprises a first centrifugal pump, wherein a liquid outlet of the first centrifugal pump is connected with a first tee joint through a first stop valve; the air compressor is further provided, an air outlet of the air compressor is connected with the mass flow meter through a needle valve, and a delivery pipeline of compressed air is connected with the medium delivery pipe chariot of the first centrifugal pump; the magnetic solid-liquid two-phase fluid at the left end outlet of the first tee joint is mixed with the compressed air output by the mass flow meter and then flows along the vertical pipeline, an air separator is arranged at the tail end of the vertical pipeline, the solid-liquid two-phase fluid after air separation is continuously conveyed to the inclined pipeline to be tested and finally returns to the inlet of the first centrifugal pump through the second tee joint and the second stop valve; and the other vertical pipeline is connected with the inclined pipeline and the second tee joint, and the tail end of the other vertical pipeline is connected with the sampling volume box through a switch valve.
The device comprises an inclined pipeline to be tested, an induction coil group, a reduction coil group and a power supply, wherein the outer sleeve of the inclined pipeline to be tested is provided with the induction coil group, and the induction coil group is also connected with the reduction coil group in series; the induction coil group and the reduction coil are both provided with induction coils and excitation coils.
Technical solution according to the technical solution provided in the embodiment of the present application, the present invention achieves the following technical effects:
1. air bubbles formed by an air compressor are used for driving the solid-phase medium and the liquid-phase medium in the solid-liquid two-phase to be rapidly mixed, so that the flowing form of the solid-liquid two-phase medium in the actual industrial production process is simulated.
2. The measurement result is calibrated to obtain the final measurement result, the accuracy is high, and the test proves that the accurate measurement of the solid phase medium with the concentration of less than 0.84 vol.% can be realized.
3. The method is characterized in that a magnetic field is generated by an electromagnetic induction method, the measured industrially conveyed solid-liquid two-phase fluid cuts a magnetic induction line to generate induced electromotive force, the concentration of the solid-phase medium in the solid-liquid two-phase fluid is indirectly measured by measuring the induced electromotive force, automatic real-time test can be realized, and the concentration of the solid-phase medium and the real-time change of the concentration of the solid-liquid two-phase medium in the flowing dynamic process can be monitored in real time.
4. The aqueous magnetofluid with magnetic particles as ferrite has small temperature dependence, prevents the interference on the test result caused by the change of temperature and improves the test accuracy.
5. The induction coil group and the reduction coil group are connected in series, and can resist the reverse voltage of the induced electromotive force generated by the induction coil, and the reduction coil group can improve the detection rate of the induced electromotive force caused by the magnetization of the magnetic fluid.
6. The exciting coils of the induction coil group and the reduction coil group are all Helmholtz magnetic coils, so that the uniformity of a generated magnetic field is improved, the measured fluid medium is conveniently magnetized, and the measurement accuracy is improved.
Drawings
FIG. 1 is a schematic view of a measuring apparatus used in the method for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid according to the present invention
FIG. 2 is a schematic diagram of the detection of induced electromotive force in the method for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid according to the present invention
FIG. 3 is a waveform diagram of the detection induced electromotive force in the method for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid according to the present invention
Wherein: 1-1 is a first centrifugal pump, 1-2 is a second centrifugal pump, 2.1 is a first stop valve, 2.2 is a second stop valve, 2.3 is a third stop valve, 2.4 is a fourth stop valve, 2.5 is a needle valve, 3.1 is a first tee joint, 3.1 is a second tee joint, 4 is an air compressor, 5 is a mass flowmeter, 6 is an air separator, 7.1 is a first pressure gauge, 7.2 is a second pressure gauge, 8 is a pressure data recorder, 9 is an induction coil group, 9.1 is an induction coil, 9.2 is an excitation coil, 10 is a reduction coil group, 10.1 is an induction coil, 10.2 is an excitation coil, 11 is a signal amplifier, 12 is a high-pass filter, 13 is an analog-to-digital conversion computer, 14 is a bipolar power supply, 15 is a signal generator, and 16 is a sampling volume box.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described below clearly and completely, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, a method for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid, which uses an electromagnetic induction method to generate a magnetic field, cuts a magnetic induction line with the measured solid-liquid two-phase fluid to generate induced electromotive force, and indirectly measures the concentration of the solid-phase medium in the solid-liquid two-phase fluid by measuring the induced electromotive force, is characterized by comprising the steps of:
step 1, preparing the aqueous magnetofluid, namely diluting the aqueous magnetofluid to a concentration of 0.1 vol.% by using distilled water, and mixing the diluted aqueous magnetofluid with the concentration of 0.1 vol.% with the measured solid-liquid two-phase fluid as a liquid phase carrier of the measured solid-liquid two-phase fluid, wherein magnetic particles of a solid phase in the aqueous magnetofluid are ferrite.
Step 2, opening a first stop valve 2.1 and a second stop valve 2.2, closing a third stop valve 2.3 and a fourth stop valve 2.4, starting a first centrifugal pump 1-1 to enable a medium in a pipeline to circularly flow, circularly conveying only 0.1 vol.% aqueous magnetic fluid in the pipeline by using the first centrifugal pump 1-1, starting an air compressor 4, opening a needle valve 2.5, conveying pressure gas into the pipeline to drive the aqueous magnetic fluid to be uniformly mixed, starting an air separator 6 to separate gas, activating a bipolar power supply 14 through a signal generator 15 to convey current to an excitation coil 10.2 of a reduction coil group 10, connecting the reduction coil group 10 and an induction coil group 9 in series to enable the induction coil group 9 to induce a magnetic field, wherein an induction coil 9.1 on one side of the induction coil group 9 is respectively connected to a signal amplifier 11 and an induction coil 10.1 on one side of the reduction coil group 10, and an induction coil 9.1 on the other side of the induction coil group 9 is also respectively connected to the signal amplifier 11 and the reduction coil group 10 The induction coil 10.1 at the other side of the group 10, and the induction coils 10.1 at the two sides of the reduction coil group 10 are respectively connected to the signal amplifier 11; the signal amplifier 11 is connected with a high-pass filter 12, and the high-pass filter 12 is connected with an analog-to-digital conversion computer 13; the induction coil 10.1 on one side of the reduction coil assembly 10 is connected to the excitation coil 9.2 of the induction coil assembly 9, and an induced electromotive force V (q is 0) is generated by reading the water-based magnetic fluid cutting magnetic induction line in the inclined pipeline through an analog-to-digital conversion computer 13.
Step 3, releasing the aqueous magnetofluid with the preset volume in the measuring device, and opening the switch valve of the sampling volume box 16 to sample the water with the preset volumeAfter the liquid two-phase fluid is mixed with 0.1 vol.% of aqueous magnetofluid, the switch valve of the sampling volume box 16 is closed, the air compressor 4 is continuously utilized to convey pressure gas into the pipeline to drive the aqueous magnetofluid to be uniformly mixed with the sampled measured solid-liquid two-phase fluid, the air separator 6 is opened to separate gas, the bipolar power supply 14 is continuously activated by the signal generator 15 to convey current to the excitation coil 10.2 of the reduction coil group 10, and the analog-to-digital conversion computer 13 is used for reading the fluid medium cutting magnetic induction line formed by mixing the aqueous magnetofluid in the inclined pipeline and the sampled measured solid-liquid two-phase fluid to generate induced electromotive force V (q) (q is the induced electromotive force V generated by cuttingexp)。
And 4, discharging all mixed fluid media in the pipeline, closing the air separator 6, closing the first stop valve 2.1, the second stop valve 2.2 and the first centrifugal pump 1-1, closing the signal generator 15 and the bipolar power supply 14, opening the third stop valve 2.3 and the fourth stop valve 2.4, starting the second centrifugal pump 1-2 to pump clean water, cleaning the pipeline, and then conveying dry pressure gas into the pipeline by using the air compressor 4 to dry the pipeline.
And 5, closing the third stop valve 2.3, the fourth stop valve 2.4 and the second centrifugal pump 1-2, opening the first stop valve 2.1 and the second stop valve 2.2, starting the first centrifugal pump 1-1, opening a switch of the sampling volume box 16 to fill the pipeline with the sampled solid-liquid two-phase fluid, circularly driving the sampled measured solid-liquid two-phase fluid in the pipeline by the first centrifugal pump 1-1, continuously utilizing the air compressor 4 to convey pressure gas into the pipeline to drive the sampled solid-liquid two-phase fluid to be uniformly mixed, opening the air separator 6, separating gas, activating the bipolar power supply 14 through the signal generator 15 to convey current to the excitation coil 10.2 of the reduction coil group 10, and reading the sampled measured solid-liquid two-phase fluid in the inclined pipeline through the analog-to-digital conversion computer 13 to cut a magnetic induction line to generate induced electromotive force V (q is 1).
The theoretical basis of the measurement is that the induced electromotive force V generated by cutting the magnetic induction lines by the fluid medium in the inclined pipeline, the magnetic field intensity H of the inclined pipeline, the number of turns n of the induction coil and the relative magnetization M of the fluid medium in the inclined pipelinemfHas the following relationship:
wherein mu0The magnetic permeability of the fluid medium in the inclined pipeline is shown, t is the sampling time of the test data, and S is the cross-sectional area of the inclined pipeline perpendicular to the direction of the magnetic induction line.
Therefore, the concentration q of the solid-phase medium in the solid-liquid two-phase fluid measured in step 6 is corrected and calculated:
and Δ V(cal.)＝Vrms(q＝0)-Vrms(q1)In which V isrms(q＝0)When only the aqueous magnetofluid is in the inclined pipeline in the step 2, the magnetofluid cuts the magnetic induction lines to generate a plurality of groups of induced electromotive force V (q is 0) values; wherein Vrms(exp)When the aqueous magnetofluid in the inclined pipeline in the step 3 is mixed with the sampled measured solid-liquid two-phase fluid, the mixture cuts a plurality of groups of induced electromotive force V (q) generated by magnetic induction linesexp) A root mean square value of the values; wherein Vrms(q＝1)And 5, when only the measured solid-liquid two-phase fluid is sampled in the inclined pipeline in the step 5, cutting the magnetic induction lines to generate multiple groups of induced electromotive force V (q is 1) values.
All the pipelines are transparent pipelines, so that the flowing form of the fluid medium is convenient to observe.
The switching valve of the sample volume tank 16 is an electromagnetically controlled switching valve.
The first centrifugal pump 1-1 and the second centrifugal pump 1-2 are arranged in parallel.
The second centrifugal pump is connected with the clean water tank and driven by the motor.
The inclined angle of the inclined pipe is 30 degrees.
Pressure gauges 7.1 and 7.2 are arranged at two ends of the inclined pipeline to be measured, and a pressure data recorder 8 is connected between the two pressure gauges.
The exciting coils (9.2, 10.2) of the induction coil set 9 and the restoring coil set 10 both adopt Helmholtz magnetic coils.
An analog-to-digital converter in the analog-to-digital conversion computer 13 converts the instantaneous induced electromotive force into a digital signal, the sampling frequency is 1000hz, the sampling number is 5000, the specifications of the analog-to-digital converter are that the voltage input range is plus or minus 10V, and the resolution is 16 bit.
The measuring device used in the method for measuring the concentration of the solid-phase medium in the solid-liquid two-phase fluid comprises a first centrifugal pump 1, wherein a liquid outlet of the first centrifugal pump 1 is connected with a first tee joint 3.1 through a first stop valve 2.1; the air outlet of the air compressor 4 is connected with a mass flow meter 5 through a needle valve 2.5, and a delivery pipeline of compressed air is connected with a medium delivery pipe chariot of the first centrifugal pump 1; the magnetic solid-liquid two-phase fluid at the left end outlet of the first tee 3.1 is mixed with the compressed air output by the mass flow meter 5 and then flows along the vertical pipeline, an air separator 6 is arranged at the tail end of the vertical pipeline, the solid-liquid two-phase fluid after air separation is continuously conveyed to the inclined pipeline to be tested and finally returns to the inlet of the first centrifugal pump 1 through a second tee 3.2 and a second stop valve 2.1; and the connection between the inclined pipeline and the second tee 3.2 is another vertical pipeline, the end of which is connected with the sampling volume box 16 through a switch valve;
wherein, the outside of the inclined pipeline to be measured is sleeved with an induction coil group 9, and the induction coil group 9 is also connected with a reduction coil group 10 in series; the induction coil assembly 9 and the reduction coil 10 each have an induction coil (9.1, 10.1) and an excitation coil (9.2, 10.2).
Technical solution according to the technical solution provided in the embodiment of the present application, the present invention achieves the following technical effects:
1. air bubbles formed by an air compressor are used for driving the solid-phase medium and the liquid-phase medium in the solid-liquid two-phase to be rapidly mixed, so that the flowing form of the solid-liquid two-phase medium in the actual industrial production process is simulated.
2. The measurement result is calibrated to obtain the final measurement result, the accuracy is high, and the test proves that the accurate measurement of the solid phase medium with the concentration of less than 0.84 vol.% can be realized.
3. The method is characterized in that a magnetic field is generated by an electromagnetic induction method, the measured industrially conveyed solid-liquid two-phase fluid cuts a magnetic induction line to generate induced electromotive force, the concentration of the solid-phase medium in the solid-liquid two-phase fluid is indirectly measured by measuring the induced electromotive force, automatic real-time test can be realized, and the concentration of the solid-phase medium and the real-time change of the concentration of the solid-liquid two-phase medium in the flowing dynamic process can be monitored in real time.
4. The aqueous magnetofluid with magnetic particles as ferrite has small temperature dependence, prevents the interference on the test result caused by the change of temperature and improves the test accuracy.
5. The induction coil group and the reduction coil group are connected in series, and can resist the reverse voltage of the induced electromotive force generated by the induction coil, and the reduction coil group can improve the detection rate of the induced electromotive force caused by the magnetization of the magnetic fluid.
6. The exciting coils of the induction coil group and the reduction coil group are all Helmholtz magnetic coils, so that the uniformity of a generated magnetic field is improved, the measured fluid medium is conveniently magnetized, and the measurement accuracy is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid, which utilizes an electromagnetic induction method to generate a magnetic field, cuts a magnetic induction line by the measured solid-liquid two-phase fluid to generate induced electromotive force, and indirectly measures the concentration of the solid phase medium in the solid-liquid two-phase fluid by measuring the induced electromotive force, and is characterized by comprising the following steps:
step 1, preparing aqueous magnetofluid, namely diluting the aqueous magnetofluid to a concentration of 0.1 vol.% by using distilled water, and mixing the diluted aqueous magnetofluid with the concentration of 0.1 vol.% with the measured solid-liquid two-phase fluid as a liquid phase carrier of the measured solid-liquid two-phase fluid, wherein magnetic particles of a solid phase in the aqueous magnetofluid are ferrite;
step 2, opening a first stop valve (2.1) and a second stop valve (2.2), closing a third stop valve (2.3) and a fourth stop valve (2.4), starting a first centrifugal pump (1-1) to enable a medium in the pipeline to circularly flow, circularly conveying only aqueous magnetofluid with the concentration of 0.1 vol.% in the pipeline by using the first centrifugal pump (1-1), starting an air compressor (4), opening a needle valve (2.5), conveying pressure gas into the pipeline to drive the aqueous magnetofluid to be uniformly mixed, starting an air separator (6) to separate gas, activating a bipolar power supply (14) through a signal generator (15) to convey current to an excitation coil (10.2) of a reduction coil group (10), connecting the reduction coil group (10) with an induction coil group (9) in series to enable the induction coil group (9) to induce a magnetic field, and respectively connecting the induction coil (9.1) on one side of the induction coil group (9) to a signal amplifier (11) and the induction coil group (10) on one side of the reduction coil group (10) The induction coil (9.1) on the other side of the induction coil group (9) is also respectively connected to the signal amplifier (11) and the induction coil (10.1) on the other side of the reduction coil group (10), and the induction coils (10.1) on two sides of the reduction coil group (10) are respectively connected to the signal amplifier (11); the signal amplifier (11) is connected with a high-pass filter (12), and the high-pass filter (12) is connected with an analog-to-digital conversion computer (13); an induction coil (10.1) on one side of the reduction coil group (10) is connected to an excitation coil (9.2) of the induction coil group (9), and an induced electromotive force V (q is 0) is generated by reading a water-based magnetic fluid cutting magnetic induction line in an inclined pipeline through an analog-digital conversion computer (13);
step 3, releasing the aqueous magnetofluid with the preset volume in the measuring device, opening the switch valve of the sampling volume box (16) to mix the sampled solid-liquid two-phase fluid with the aqueous magnetofluid of 0.1 vol.%, closing the switch valve of the sampling volume box (16), and continuously utilizing the air compressor (4) to convey pressure gas into the pipeline to drive the aqueous magnetofluid and the sampled measured solid-liquid two-phase fluidUniformly mixing the liquids, opening an air separator (6), separating the gases, continuously activating a bipolar power supply (14) through a signal generator (15) to transmit current to an excitation coil (10.2) of a reduction coil group (10), reading a fluid medium cutting magnetic induction line formed by mixing an aqueous magnetofluid in an inclined pipeline and a sampled measured solid-liquid two-phase fluid through an analog-to-digital conversion computer (13) to generate induced electromotive force V (q)exp)；
Step 4, discharging all mixed fluid media in the pipeline, closing the air separator (6), closing the first stop valve (2.1), the second stop valve (2.2) and the first centrifugal pump (1-1), closing the signal generator (15) and the bipolar power supply (14), opening the third stop valve (2.3) and the fourth stop valve (2.4), starting the second centrifugal pump (1-2) to pump clean water, cleaning the pipeline, and then conveying dry pressure gas into the pipeline by using the air compressor (4) to dry the pipeline;
step 5, closing the third stop valve (2.3), the fourth stop valve (2.4) and the second centrifugal pump (1-2), opening the first stop valve (2.1) and the second stop valve (2.2), starting the first centrifugal pump (1-1) and opening the switch valve of the sampling volume box (16) to fill the pipeline with the sampled solid-liquid two-phase fluid, only circularly driving the sampled measured solid-liquid two-phase fluid in the pipeline by the first centrifugal pump (1-1), continuously utilizing the air compressor (4), conveying pressure gas into the pipeline to drive the sampled solid-liquid two-phase fluid to be uniformly mixed, opening the air separator (6) to separate gas, a signal generator (15) activates a bipolar power supply (14) to supply current to the excitation coils (10.2) of the reduction coil assembly (10), reading a measured solid-liquid two-phase fluid cutting magnetic induction line sampled in the inclined pipeline by an analog-to-digital conversion computer (13) to generate induced electromotive force V (q is 1);
and 6, correcting and calculating the concentration q of the solid-phase medium in the measured solid-liquid two-phase fluid:
and Δ V(cal.)＝Vrms(q＝0)-Vrms(q＝1)In which V isrms(q＝0)For tilting the tube in step 2When only the aqueous magnetofluid is in the channel, the cutting magnetic induction line generates multiple groups of induced electromotive force V (q is 0) values; wherein Vrms(exp)When the aqueous magnetofluid in the inclined pipeline in the step 3 is mixed with the sampled measured solid-liquid two-phase fluid, the mixture cuts a plurality of groups of induced electromotive force V (q) generated by magnetic induction linesexp) A root mean square value of the values; wherein Vrms(q＝1)And 5, when only the measured solid-liquid two-phase fluid is sampled in the inclined pipeline in the step 5, cutting the magnetic induction lines to generate multiple groups of induced electromotive force V (q is 1) values.
2. The method for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid according to claim 1, wherein all the pipes are transparent pipes, so that the flow pattern of the fluid medium can be observed conveniently.
3. The method for measuring a concentration of a solid phase medium in a solid-liquid two-phase fluid according to claim 1, wherein the on-off valve of the sampling volume tank (16) is an electromagnetically controlled on-off valve.
4. The method for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid according to claim 1, wherein the first centrifugal pump (1-1) is disposed in parallel with the second centrifugal pump (1-2).
5. The method for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid according to claim 4, wherein said second centrifugal pump (1-2) is connected to a clean water tank, and said second centrifugal pump (1-2) is driven by a motor.
6. The method for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid according to claim 1, wherein the inclined angle of the inclined pipe is 30 degrees.
7. The method for measuring the concentration of a solid phase medium in a solid-liquid two-phase fluid according to claim 1, wherein pressure gauges (7.1) and (7.2) are provided at both ends of the inclined pipe to be measured, and a pressure data recorder (8) is connected between the two pressure gauges.
8. The method for measuring the concentration of a solid-phase medium in a two-phase liquid according to claim 1, wherein Helmholtz coils are used for the exciting coils (9.2, 10.2) of the induction coil assembly (9) and the reduction coil assembly (10).
9. The method for measuring the concentration of a solid-phase medium in a solid-liquid two-phase fluid according to claim 1, wherein an analog-to-digital converter in the analog-to-digital conversion computer (13) converts the instantaneous induced electromotive force into a digital signal, the sampling frequency is 1000hz, the sampling number is 5000, the specifications of the analog-to-digital converter are that the voltage input range is plus or minus 10V, and the resolution is 16 bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110010310.1A CN112858460B (en) | 2021-01-06 | 2021-01-06 | Method for measuring concentration of solid medium in solid-liquid two-phase fluid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110010310.1A CN112858460B (en) | 2021-01-06 | 2021-01-06 | Method for measuring concentration of solid medium in solid-liquid two-phase fluid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112858460A true CN112858460A (en) | 2021-05-28 |
| CN112858460B CN112858460B (en) | 2023-07-18 |
Family
ID=76003990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110010310.1A Active CN112858460B (en) | 2021-01-06 | 2021-01-06 | Method for measuring concentration of solid medium in solid-liquid two-phase fluid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112858460B (en) |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4820990A (en) * | 1987-10-09 | 1989-04-11 | Zeta Management Ltd. | Electrode-less detector |
| SU1728759A1 (en) * | 1990-01-30 | 1992-04-23 | Иркутский научно-исследовательский и конструкторский институт химического машиностроения | Transducer of local bulk concentration of dispersed phase in dispersed fluidal medium |
| JP2003083940A (en) * | 2001-09-10 | 2003-03-19 | Canon Inc | Measuring apparatus and method |
| KR20030042901A (en) * | 2001-11-26 | 2003-06-02 | 학교법인 포항공과대학교 | Electromagnetic flowmeter |
| WO2006104286A1 (en) * | 2005-03-31 | 2006-10-05 | Toyo Seikan Kaisha, Ltd. | Gas-liquid two-phase flow chromatographic apparatus and method for analysis using said apparatus |
| RU2008108678A (en) * | 2008-03-05 | 2009-09-10 | Открытое акционерное общество научно-исследовательский институт теплоэнергетического приборостроения "НИИТеплоприбор" (RU) | ELECTROMAGNETIC METHOD FOR MEASURING COSTS |
| CN102375024A (en) * | 2011-09-14 | 2012-03-14 | 西安石油大学 | Device and method for measuring phase fraction of two-phase fraction |
| JP2015040841A (en) * | 2013-08-23 | 2015-03-02 | 株式会社前川製作所 | Apparatus for measuring solid phase rate of solid-liquid two-phase fluid, cooling system, and solid phase rate measurement method |
| CN104730267A (en) * | 2015-03-31 | 2015-06-24 | 烟台大学 | Continuous, synchronous and online monitoring method and instrument for concentration and total quantity of TOC (total organic carbon), TN (total nitrogen) and TP (total phosphorus) |
| CN105547383A (en) * | 2015-12-18 | 2016-05-04 | 合肥市恒昌自动化控制有限责任公司 | Fluid flow measuring method based on electromagnetic principle |
| DE102015103484A1 (en) * | 2015-03-10 | 2016-09-15 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | In-line measuring device |
| WO2017008231A1 (en) * | 2015-07-13 | 2017-01-19 | 北京科技大学 | Stress detection system and method based on magnetoelastic phase lag effect of ferromagnetic material |
| WO2017160268A1 (en) * | 2016-03-14 | 2017-09-21 | Halliburton Energy Services, Inc. | Determining solids content using dielectric properties |
| CN108828057A (en) * | 2018-06-26 | 2018-11-16 | 西安石油大学 | A kind of oil-water two-phase flow Multi-parameter detection device and method based on electromagnetism acoustical coupling |
| CN109060937A (en) * | 2018-06-26 | 2018-12-21 | 西安石油大学 | A kind of induction type magnetic acoustical coupling oil-water two-phase flow Multi-parameter detection device and method |
| CN110736785A (en) * | 2019-11-21 | 2020-01-31 | 国网江苏省电力有限公司电力科学研究院 | cable accessory lead sealing electrical connection defect live-line detection method and device |
| CN111948341A (en) * | 2020-07-27 | 2020-11-17 | 中国石油大学(北京) | Device and method for testing bubble rising speed under solid-liquid two-phase condition |
| CN112050871A (en) * | 2020-08-25 | 2020-12-08 | 长江武汉航道工程局 | Dredger pipeline transportation passive yield meter |
-
2021
- 2021-01-06 CN CN202110010310.1A patent/CN112858460B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4820990A (en) * | 1987-10-09 | 1989-04-11 | Zeta Management Ltd. | Electrode-less detector |
| SU1728759A1 (en) * | 1990-01-30 | 1992-04-23 | Иркутский научно-исследовательский и конструкторский институт химического машиностроения | Transducer of local bulk concentration of dispersed phase in dispersed fluidal medium |
| JP2003083940A (en) * | 2001-09-10 | 2003-03-19 | Canon Inc | Measuring apparatus and method |
| KR20030042901A (en) * | 2001-11-26 | 2003-06-02 | 학교법인 포항공과대학교 | Electromagnetic flowmeter |
| WO2006104286A1 (en) * | 2005-03-31 | 2006-10-05 | Toyo Seikan Kaisha, Ltd. | Gas-liquid two-phase flow chromatographic apparatus and method for analysis using said apparatus |
| RU2008108678A (en) * | 2008-03-05 | 2009-09-10 | Открытое акционерное общество научно-исследовательский институт теплоэнергетического приборостроения "НИИТеплоприбор" (RU) | ELECTROMAGNETIC METHOD FOR MEASURING COSTS |
| CN102375024A (en) * | 2011-09-14 | 2012-03-14 | 西安石油大学 | Device and method for measuring phase fraction of two-phase fraction |
| JP2015040841A (en) * | 2013-08-23 | 2015-03-02 | 株式会社前川製作所 | Apparatus for measuring solid phase rate of solid-liquid two-phase fluid, cooling system, and solid phase rate measurement method |
| DE102015103484A1 (en) * | 2015-03-10 | 2016-09-15 | Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG | In-line measuring device |
| CN104730267A (en) * | 2015-03-31 | 2015-06-24 | 烟台大学 | Continuous, synchronous and online monitoring method and instrument for concentration and total quantity of TOC (total organic carbon), TN (total nitrogen) and TP (total phosphorus) |
| WO2017008231A1 (en) * | 2015-07-13 | 2017-01-19 | 北京科技大学 | Stress detection system and method based on magnetoelastic phase lag effect of ferromagnetic material |
| CN105547383A (en) * | 2015-12-18 | 2016-05-04 | 合肥市恒昌自动化控制有限责任公司 | Fluid flow measuring method based on electromagnetic principle |
| WO2017160268A1 (en) * | 2016-03-14 | 2017-09-21 | Halliburton Energy Services, Inc. | Determining solids content using dielectric properties |
| CN108828057A (en) * | 2018-06-26 | 2018-11-16 | 西安石油大学 | A kind of oil-water two-phase flow Multi-parameter detection device and method based on electromagnetism acoustical coupling |
| CN109060937A (en) * | 2018-06-26 | 2018-12-21 | 西安石油大学 | A kind of induction type magnetic acoustical coupling oil-water two-phase flow Multi-parameter detection device and method |
| CN110736785A (en) * | 2019-11-21 | 2020-01-31 | 国网江苏省电力有限公司电力科学研究院 | cable accessory lead sealing electrical connection defect live-line detection method and device |
| CN111948341A (en) * | 2020-07-27 | 2020-11-17 | 中国石油大学(北京) | Device and method for testing bubble rising speed under solid-liquid two-phase condition |
| CN112050871A (en) * | 2020-08-25 | 2020-12-08 | 长江武汉航道工程局 | Dredger pipeline transportation passive yield meter |
Non-Patent Citations (7)
| Title |
|---|
| QUAN, H 等: "Mathematical modeling for the evolution of the large- and meso-scale vortex in the screw centrifugal pump with the buoyancy effect", ADVANCES IN MECHANICAL ENGINEERING, vol. 9, no. 5, pages 1 - 12 * |
| RAJINDER PAL: "Metering of Two-Phase Liquid-Liquid Emulsions: A State of the Art Review", INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, vol. 33, no. 6, pages 1413 - 1435 * |
| 史广泰 等: "天然气水合物颗粒浓度对多相混输泵流动特性的影响", 第32届全国天然气学术年会（2020）论文集, pages 1 - 6 * |
| 潘越 等: "固液两相流泵性能参数影响实验", 机电工程技术, vol. 43, no. 11, pages 45 - 47 * |
| 赵晓亮: "搅拌机械内固液两相流混合的数值模拟研究", 中国优秀硕士学位论文全文数据库工程科技Ⅱ辑, no. 03, pages 039 - 52 * |
| 金守泉: "固液两相双流道泵的数值模拟与实验研究", 中国优秀硕士学位论文全文数据库工程科技Ⅱ辑, no. 2, pages 029 - 164 * |
| 钟新荣 等: "SS2000型混砂车流量计量改造技术研究与应用", 石油和化工设备, vol. 18, no. 07, pages 61 - 65 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112858460B (en) | 2023-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2539640C (en) | Detection and measurement of two-phase flow | |
| WO2019000259A1 (en) | Detection device and method for circulating type gas turbine flowmeter | |
| CN202075022U (en) | On-line real-flow verification device for small natural gas flow meter | |
| CN110057728B (en) | Multi-feature pipe section, multi-angle position and particle concentration controllable erosion deposition testing device and testing method | |
| CN206229214U (en) | Membrane component test device | |
| CN102080767B (en) | Method and device for detecting oil mixing interface in sequential oil transportation | |
| CN107796794B (en) | Online oily sewage detection method based on ultraviolet fluorescence method | |
| CN109884263B (en) | Dissolved oxygen sensor test device and test method thereof | |
| CN207609548U (en) | Water pump testing system | |
| CN104391092A (en) | Multi-gas detection based gas inlet device | |
| CN202256098U (en) | Device for measuring density of liquid on line | |
| CN204514402U (en) | A kind of differential pressure mass flowmeter for vortex street | |
| CN112858460B (en) | Method for measuring concentration of solid medium in solid-liquid two-phase fluid | |
| CN112858463B (en) | Device for measuring concentration of solid medium in solid-liquid two-phase fluid | |
| CN202275034U (en) | Concentration detection device | |
| CN105699613A (en) | Water quality monitoring system | |
| CN203630059U (en) | Nuclear magnetic resonance technology-based online crude oil moisture content monitor | |
| CN201408136Y (en) | Motor particle discharge secondary dilution and part flow dilution sampling constant-current device | |
| CN212643022U (en) | Wall hanging is circulating water pump's for stove test system | |
| CN113375982A (en) | Three-point skid-mounted sampling device | |
| CN202793892U (en) | Stirring device in automatic sample injector | |
| CN102539153A (en) | Device for detecting flow capacity of passage in turbine blade by adopting fixed volume water flow | |
| CN206515109U (en) | Mix sampling apparatus | |
| CN201637510U (en) | On-line liquid cement grinding additive detection device | |
| CN204649252U (en) | A kind of taper mass flowmeter for vortex street |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |